Examine source code of Environment Hop

{
  "name": "Environment Hop",
  "description": "Open the current page on different environments!",
  "version": "4.0.1",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "browser-polyfill.js",
      "background.js"
    ],
    "persistent": true
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "permissions": [
    "activeTab",
    "contextMenus",
    "storage",
    "tabs",
    "http://*/*",
    "https://*/*"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "export128px.png"
  },
  "action": {
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "icons": {
    "128": "export128px.png"
  },
  "applications": {
    "gecko": {
      "id": "environment-hop@modea.com",
      "strict_min_version": "109.0"
    }
  }
}